Giant cardiac hydatid cyst in the interventricular septum protruding to right ventricular epicardium.

Cardiac hydatid cyst is a rare condition, and the location of a hydatid cyst in the interventricular septum is exceptional. A 54-year-old female was admitted to our hospital with complaints of chest pain, shortness of breath and malaise. Transthoracic echocardiography defined a cystic mass lesion of 50 × 59 mm originating from apex of the heart protruding into and compressing the interventricular septum. The cyst was excised surgically and the patient was discharged on the 8th postoperative day without symptoms. In our case, localization of the cystic mass was within interventricular septum which is an uncommon site. It limited both ventricular volumes significantly. In addition, this cyst was extensively protruding to the right ventricular epicardium.